The Stygian ringlet (Erebia styx) is a butterfly belonging to the subfamily Satyrinae, the "browns", within the family Nymphalidae. It is found locally in the Alps on dry limestone slopes. It is very similar to the Styrian ringlet (E. stirius) and has sometimes been included in that species.
It has a wingspan of 46–56 mm.[2] The upperwings of both sexes are mostly brown with reddish bands near the edge (postdiscal bands). The bands vary in size and may be dusted with brown in the males.[3] Within the bands are a variable number of eyespots (ocelli); these are black with white centres. The forewing has a large eyespot near the tip, often with two white centres. The hindwing has three or four spots.[3]
The underside of the male's forewing is largely orange with brown dusting in the basal half and a brown border. Unlike in the Styrian ringlet, the brown border does not taper towards the rear of the wing and has a dark "tooth" projecting into the orange[3][4] The tooth is less conspicuous in the females. The underside of the hindwing is mostly brownish, darker in the basal half.[3]
The subspecies E. s. triglites of the Bergamo Alps and Monte Generoso is more strongly marked than the nominate subspecies E. s. styx. It has a larger postdiscal band and larger eyespots on the upper forewing while the underside of the hindwing sometimes lacks eyespots.[4]
The subspecies E. s. trentae of the Julian Alps is even more strongly marked. It has large eyespots with bright white centres.[4]
It occurs in the Alps at altitudes of 600–2,200 metres. It is found in northern Italy from near Monte Generoso to the Dolomites, in Ticino canton in south-east Switzerland, in the Allgäu Alps in south-east Germany, in parts of Austria and in the Julian Alps in Slovenia. It inhabits steep limestone slopes with scattered trees and bushes. It favours warm, dry, rocky areas.[4]
The barrel-shaped eggs are grey-brown with brown spots and prominent ribs.[3] The caterpillars are grey-brown with lighter and darker stripes and can reach 20–25 mm in length.[3] They feed on grasses, particularly Sesleria varia. They take up to two years to mature, hibernating during the first and penultimate instars.[3] The butterfly pupates among stones and grass in a green and brown chrysalis.[3] The adults fly from early July until early September. A single brood is produced each year.[4]
Named in the Classical tradition.Styx was the name of an Oceanid nymph, one of the three thousand daughters of the Titans Oceanus and his sister-wife Tethys, and the goddess of the River Styx. Others make her one of the progenies of the primordial gods, Nyx (Night) and Erebus (Darkness)
The Stygian ringlet (Erebia styx) is a butterfly belonging to the subfamily Satyrinae, the "browns", within the family Nymphalidae. It is found locally in the Alps on dry limestone slopes. It is very similar to the Styrian ringlet (E. stirius) and has sometimes been included in that species.
Erebia styx
Le Moiré stygien (Erebia styx) est un lépidoptère appartenant à la famille des Nymphalidae, à la sous-famille des Satyrinae et au genre Erebia.
Erebia styx a été nommé par Christian Friedrich Freyer en 1834[1].
Le Moiré stygien se nomme Stygian Ringlet en anglais[1].
Le Moiré stygien est un petit papillon marron foncé à bande postdiscale cuivre foncé avec deux ocelles geminés ou non pupillés de blanc à l'apex de l'aile antérieure et trois ocelles pupillés de blanc aux postérieures dans la bande postdiscale orange entrecoupée par les nervures.
Le revers de l'aile antérieure est roux plus ou moins foncé suivant les sous-espèces, bordé de marron avec les deux ocelles le plus souvent géminés pupillés de blanc à l'apex alors que le revers des postérieures est marron pour le mâle, gris clair chiné pour la femelle, les deux avec trois à quatre petits ocelles pupilles de blanc en ligne postdiscale.
Le développement larvaire se déroule sur deux cycles saisonniers dans certaines localités[2].
L'imago vole de début juillet à début septembre[2].
La plante hôte de ses chenilles est Sesleria varia[2].
Il est présent dans les Alpes dans le sud-est de la Suisse, le nord de l'Italie, le sud-est de l'Allemagne et de l'Autriche et l'ouest de la Slovénie[2].
En France il a été anciennement signalé dans le département des Vosges[3]
Il réside sur les pentes rocheuses sèches.
Erebia styx
Le Moiré stygien (Erebia styx) est un lépidoptère appartenant à la famille des Nymphalidae, à la sous-famille des Satyrinae et au genre Erebia.
Callerebia mani is een vlinder uit de onderfamilie Satyrinae van de familie Nymphalidae.[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1880 door Lionel de Nicéville.
Bronnen, noten en/of referenties
Pòch conossù.
A viv an sj'Alp, ma a l'é na specie creà da pòch temp.
Pòch conossù.
DistribussionA viv an sj'Alp, ma a l'é na specie creà da pòch temp.
